Furnace-door



(No Model.)

J. HEATLBY.

PURNAGE D003.

No. 412.884. Patented Oct. 15, 1889.

Y IO

f furnace-door.

`thereof on the Aline II II of Fig. l. Fig. 3 is Fig.

, @turen STATES Ferrini rtree.

.IOI'IN IIEATLEY, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONF-HALF TO THOMAS R. VENNERS, OF SAME PLACE.

f FU RNACE-DOOR.

SECFICATION forming part of Letters Patent No. 412,884, dated October 15, 1889.' Application filed February ll, 1889. Serial No. 299,418. (No model.)

To @Zwtom it may concern:

ne uimown that i, JOHN HEATLEY, of Putsburg, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in l `urnaceDoors,ot which the following is a full, clear, and exact de; scription, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a front elevation of my improved Fig. 2 is a vertical section a horizontal crossfsect-ion on the line `III III ot' l. Fig.4 is a similar section on the line IV IV of Fig. l. Fig. 5 is a similar section on the line V V of Fig. l. Fig. 6 is a perspective view of the reversible back plate. '7 is a perspective view 4ot the fore plate. Fig. Sis A-a perspective view of one of the cheeks.

Like'symbols oi reference indicate like parts in each.

In the drawings, 2 represents thebed or hearth ot' a puddling-furnace, and l is the cinder-plate. f

The door-frame is composed of vertical side bars 3, a bottom piece 4, and a plate or crosspiece 5 at the upper end. The side pieces 3 are set against the masonry in the'doorway of the furnace. The bottom piece 4 is bolted to the cinder-plate, and the cross-piece 5 iits within the groove b of a back plate 6. This back plate is of peculiar construction, and is represented in Fig. 6. At the ends it is provided with extending arms c, of less thickness than the ungrooved middle portion of the plate. The middle portion of the cross-piece 5 iits against the back of the groove h, and is provided with oiicset shoulders or projections CZ, fitting between the arms c. The shoulders d of the door-frame are secured to the iron plates 9, forming the facing of the furnace, by means of bolts 7 and the d0or-frame and back plate are backed with masonry S, as clearly shown in Fig. 2. The plate 9 is provided with outwardly projecting vertical iianges, which iit against the outer sides of the door-frame, as shown in Figs. 3, 4, and

5. The lower portion of the side pieces 3 of the door-frame are provided with lateral recesses, in which are set vertical cheek-pieces rl0, as shown in Fig. 4 these cheek-pieces being made of T shape, having shanks which iit against ihc side pieces of the dooikframe in said recesses, and having heads ICI on the interior of the furnace-wall which fit against the back edge of the door-frame and project inwardly beyond the samel to form a lbacking for the door and to protect the edges of the frame from heat. The cheeks are secured to the door-frame and plates 9 by bolts, as shown in Fig. l

The door consists of ametal frame ll, having an inwardly-projecting marginal iiange at the top and sides, thus forming a concave or scoop-like frame, in which the masonry backing l2, of fire-bricks, may be built. At the lower part of the door the lateral marginal fia-nge is cut away, and the door is provided with an extensible foot-piece lf3, which is flanged at the front and bottom, so as to tit over and to be capable of adjustment telescopically or extcnsibly on the lower portion of the door, The middle portion of the front of the extensible foot projects upwardly a considerable distance, as shown in Fig. l, and is provided with an opening 14, and on the inner side of the foot, separated from the vertical portio`n thereof suiiiciently to allow of the intervention ot' the front plate of the door, is a cast-iron block l5, which is secured to the bottom iiange of the foot, and which forms the lining for the working-hole 14.

16 is a lug cast on the foot 13, and 1,7 are lugs cast on the door-plate in line therewith. A bolt 18 passes through the lugs l0 and 17, and by means of a nut i9 and washer 23 on this bolt the foot 13 and the door-plate ll may be adj ustably drawn together to compress the refractory lining' l2 and to hold the parts of the door iirmly together. In this way I am enabled, after the refractory lining has been built in place, to draw the parts ot' the door together, thus making it very compact and solid. In order to guide the parts of the door when they are thus drawn together and to preserve them in proper relative position, I prefer to provide the lateral marginal liange-s of the foot 13 with guide ribs or lugs 20. (See Fig. 4.) At the base of the door, on the crosspiece 4 of the same, is a tore plate 2l, provided with a downwardly-projecting dan ge or shoul- IOO der e at the front edge, which tits over the edges of the cross-piece and serves to hold the fore plate from backward displacement.

It is prevented from forward displacement by4 Afurnacedoor which is most liable to destruction by the heat is the back plate, and when this plate is made integral with the doorframe, as has been the practice heretofore, the whole door-frame must be removed and thrown away, when the lower portion of the back plate is burned. In the use of my iinproved furnace-door the back plate may be taken out and reversed when its lower edge is burned, so that the destroyed or partially destroyed lower edge shall become the top edge and that the uninjured top edge of the plate shall be at the bottom, which is the place of greatest heat.

The construction which I have describedis adapted for use in puddlingfurnaces, where it is necessary to have a working hole, through which the rabble of the puddler is inserted. TvVhen the door is used on heatingfurnaces, this work-hole -is unnecessary, and the eXtensible foot maybe made imperforate and without the block 15. In case the door is to be applied to the closing of openings of considerable width, two or more of the bolts 18 may be employed, in order to impart to the door sufficient strength and rigidity.

My invention is susceptible of other modiiications in form, arrangement, and details of construction,such as will suggest themselves to those skilled in the art of turn ace-building, and itsadvantages willbeappreciatedbythem.

The door is very strong an d durable, and not apt to burn or warp with the heat. The fore plate, the cheeks, and the back plate may be renewed from time to time as'theywear out.

I claim- 1. The furnace-door comprising the frame 11, an extensible foot, and an interposed backing 12, substantially as and for the purposes described.

2. The furnace-door comprising the frame 11, an eXtensible foot, an interposed backing 12, and a bolt connecting the frame and foot for drawing the saine together, substantially as and for the purposes described.

3. The furnace-door comprising the frame 11, an extensible foot, an interposed backing 12, a bolt connecting the frame and foot for drawing the same together, and lugs 16 and 17, through which the bolt passes, substantially as and for the purposes described.

4. The doorway-frame having Vertical sides and cross-pieces at the top and bottom, the cross-piece at the top being secured to the furnace-wall and the cross-piece at the bottom being secured to the cinder-plate, substantially as and for the purposes described.

5. The combination, with the doorwayframe having at the base a cross-piece flanged, as at 7i, of a fore plate which fits on the crosspiece and is provided with a projecting retaining' i'lange or shoulder e, substantially as and for the purposes described.

G. The combination, with the doorway- 'frame having a cross-piece at the upper end thereof, of a reversible back plate having a recessed portion b, which iits over the crosspiece, substantially as and for the purposes described.

7. The combination, withl the doorwayframe having a cross-piece at the upper end thereof, of a reversible back plate having a recessed portion h, which fits over the crosspiece and is provided with projecting arms c, substantially as and for the purposes described.

S. The furnace-door comprising the frame 11, an extensible foot, and an interposed backing 12, said foot being provided with guide ribs or lugs 20, substantially as and for the purposes described.

9. The furnace-door comprising the frame 11, an extensible foot, and an interposed backing 12, said foot being provided with a workhole 14 and a lining-block 15, substantially as and for the purposes described.

In testimony whereof I have hereunto set myhand this 4th day of February, A.D. 1889.

JOHN I'IEATLEY.

Vitnesses:

THOMAS W. BAKEWELL, W. B. CoRwrN. 

